Technology

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Apple hasn't said exactly how long this time interval is, but to create the much-needed alert system, Apple made some crucial changes to the location privacy design the company originally developed a few years ago for its “Find My” device tracking feature.

The idea is that this way other devices can detect potential stalking, but won't be throwing up alerts all the time if you spend a weekend with a friend who has their iPhone and the AirTag on their keys in their pockets.

In practice, though, the researchers say that these changes have created a situation where AirTags are broadcasting their location to anyone who's checking within a 30- to 50-foot radius over the course of an entire day—enough time to track a person as they go about their life and get a sense of their movements.

“We had students walk through cities, walk through Times Square and Washington, DC, and lots and lots of people are broadcasting their locations,” says Johns Hopkins cryptographer Matt Green, who worked on the research with a group of colleagues, including Nadia Heninger and Abhishek Jain.

Apple has been working with companies like Google, Samsung, and Tile on a cross-industry effort to address the threat of tracking from products similar to AirTags.

And for now, at least, the researchers say that the consortium seems to have adopted Apple's approach of rotating the device public identifiers once every 24 hours.

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